Air-compressor.



No. 664,230. Patented Dec. I8, 1900.

H. M. SALYER. AIR COMPRESSOR. (Application filed Sept. 22, 1899.) W (No Model.) T

WITNESSES: INVENTOR ATTORNEY 7 THE NORRIS PETERS ca, PHOTO-LITHQ, WASNINGTON. n. c.

. UNITED STATES PATENT @FFICE.

HARRY M. SALYER, OF NEW YORK, N. Y.

AIR-COMPRESSOR.

SPECIFICATION formingpart of Letters Patent No. 664,230, dated December 18, 1900.

Application filed September 22, 1899. Serial No. 731,349. (No model.)

To aZZ whom it may concern:

Be it known that I, HARRY M. SALYER, a citizen of the United States, residing at 968 South Boulevard, in the borough of Bronx, city of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Air- Compressors, of which the following is a specification.

The object of my invention is to provide a newand improved air-compressor which is simple in construction, strong and durable, and especially adapted for compressing air for use in operating mechanical musical instruments and like small mechanisms.

In the accompanying drawings, forming a part of this specification, and in which like letters of reference indicatelike parts in all the views, Figure l is a plan view of my improved air-compressor. Fig. 2is a verticallongitudinal sectional view of the same. Fig. 3 is a plan View of the central block containing the valves. Fig. 4 is avertical transverse sectional view through the same, showing one end of the cylinder and the piston therein. Fig. 5 is a detail view of the valve.

A rectangular block A is provided on each side with a circular neck B, having an external screw-thread, so as to adapt the inner internally-screw-threaded ends of four cylinders O to be screwed on said necks, so that the four cylinders project radially at right angles to each other from the central block A. Each cylinder is closed at its outer end by a head D, having vents D, and through the center of each head D a piston-rod E passes, the internal end of which carries a piston F, fitting in the cylinder and having a leather, rubber,or other packing F.

To the outer end of each piston-rod F a cross-head G is secured, the lower end of each head being connected by a connecting-rod H with a pin on the end of a crank-arm J on the lower end of a shaft K, which is journaled in the central bore K of the block A. On the upper projecting end of said shaft K a belt-pulley L is secured, which is also provided with a crank-arm J like the crankarm J, and this crank-arm J is connected with the upper end of each cross-head G by a connecting-rod H, so that When the pulley L is rotated by means of a belt passing around the blockthat is, from the internal ends of the cylinder to the top and bottom surfaces of the block. The lower ports 0 lead into the open air at the bottom of the block A, and the upper ports M terminate in a ringshaped channel P, formed in the top of the block and closed by a top plate Q, secured on the block, which channel is in communication with the discharge-pipe R for the compressed .air, and said discharge-pipe is secured on the plate Q.

Each upper channel M is provided at its upper eudthat is, with the end connected with the channel P-with a seat a for a puppet-valve d, the seat and valve being so shaped that when the valve rests on its seat it forms a tight joint, and said upperpuppetvalve (1 is so mounted as to open outwardly.

Each bottom port 0 is provided with a seat e for an inwardly-opening puppet-valve d, the said seat and valve being also so shaped as to fitsnuglyandformatightjoint. Asisclearly shown in Fig. 4, in the right-hand side the bottom puppetvalves d are pressed upon their seats when the corresponding piston moves inwardthat is, when the air is compressed-and prevent the escape of compressed air through ports 0; but the upper valves d are raised off their seats during the inward stroke of the corresponding piston by the compressed air, permitting the air that is compressed by the inward-moving piston to pass into the channel P, from which it is conducted from the pipe R to a motor or other appliance to be operated by compressed air. When a piston moves outward, the suction holds the upper valve (1 on its seat, thus preventing the compressed air from the channel P from passing into the inner end of the corresponding cylinder, and at the same time the suction of the outgoing piston'raises the lower valve d 01f its seat, permitting the air to be drawn through the bottom channel 0 into the inner end of the cylinder, which air that has been drawn in is compressed during the return strokethat is, the instroke of the pistonand forced into the channel P and from the same through the pipe B.

As will be seen from Figs. 1 and 2, when the piston in one cylinder moves outward the piston in the other moves inward; but all four pistons are in operation together, and thus a constant uniform supply of compressed air is produced.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In an air-compressor, the combination with a central block having an externallythreaded neck on each side, cylinders having their inner ends threaded and screwed on said necks, pistons in the cylinder piston-rods, a central shaft passing through the boss, means for rotating said central shaft, means for operating the piston-rods from the central shaft, a channel in the top of the central block, outlet-ports extending from said channel to the inner end of each cylinder, an outwardlyopening valve in each port, an inlet-port extending from the inner end of each cylinder to the outer air, an inwardly-opening valve in each inlet-port and means for conducting compressed air from the said channel, substantially as herein shown and described.

2. In an air-compressor, the combination with a central block, cylinders extending radially from said block and which block has a channel formed in its upper surface, a plate secured on the block for closing said channel, an outlet-port extending from the channel to the inner end of each cylinder, an outwardlyopening valve in each outlet-port, an inlet port opening for each cylinder from the outer air, an inwardly-opening valve in each inletport, said ports being formed in the central block, a shaft passing through the central block, a piston in each cylinder, a piston-rod on each piston and means for reciprocating said piston from the central shaft, substantially as herein shown and described.

Signed at New York city, in the county of New York and State of New York, this 18th day of August, A. D. 1899.

HARRY M. SALYER.

Witnesses:

(J. A. ERICSSON, J. WINTER. 

